Which ordered pair is the on the graph of the equation 2x+5y=4?
a.(7,-2)
b.(0,-1)
c.(0,1)
d. (3,-2)

To investigate which of the choices satisfy the equation, substitute the values of the abscissas into the equation and solve for y. See if the value of y calculated is equal to the value of the ordinate of the point. 

A. (7, -2)     ;     (2)(7) + 5y = 4     ; y = -2      EQUAL

B. (0, -1)     ;     (2)(0) + 5y = 4      ; y = 0.8    NOT EQUAL

C. (0, 1)       ;     (2)(0) + 5y = 4      ; y = 0.8    NOT EQUAL

D. (3, -2)      ;     (2)(3) + 5y = 4      ; y = -0.4   NOT EQUAL

Thus, the answer is letter A.